Key control switch



June 12, 1934.

' L. BLUMEN Er AL 1,962,632

KEY CONTROL SWITCH Filed Dec. 8, 1932 Q Inventor: .Z .Blumn 1f MBZumen Patented June 12, 1934 UNITED STATES PATENT OFFICE KEY CONTROL SWITCH Leopold Blumen and Julius M. Blumen, San

1 Claim.

This invention appertains to new and useful improvements in protective systems for use especially on automobiles wherein an alarm will be given in the event any unauthorized person attempts to open the car door lock.

An important object of the present invention is to provide electrical alarm means for association with a specially devised lock whereby either an attempt to pick the lock or jimmy the bolt will result in the energization of some signalling or alarm means.

It is to be understood that the invention, while primarily intended for sedans and coup types of automobiles of courseis employable in association with locks for any type of closure.

In the drawing:-

Figure 1 represents a fragmentary outside elevational view of an automobile fragmentarily showing the wiring to the lock.

Fig. 2 represents a side elevational view of the lock proper.

Fig. 3 represents a longitudinal sectional view taken substantially on line 3-3 of Fig. 2.

Fig. 4 represents a cross sectional view taken substantially on line 4-4 of Fig. 2.

Fig. 5 represents a top plan view of the rotor.

Fig. 6 represents a cross sectional view through the lock cylinder.

Fig. '7 represents a cross sectional view taken substantially on line 9-9 of Fig. 5.

Referring to the drawing wherein like numerals designate like parts it can be seen in Fig. 1, that numeral 5 represents the body of a sedan or coup type of automobile with numeral 6 representing the lock door thereof. Numeral '7 generally refers to the lock structure which is conventional design, the same including the rotary core 8 and the tumbler shell 9.

In carrying out the present invention, the lock 40 is revised and constructed somewhat so as to include on the rotary core 8 a band 10 insulated from the core 8 by the insulating means 11. The core 8 is provided with a longitudinally extending key slot 12 opening longitudinally through the side of itself and as is clearly shown in Fig. '7, the core 8 is provided with a transversely extending bore passing through the key slot 12. In this bore are the di-electric plugs 1313 each stopping at its inner end at the slot 12 and each being provided with a contact or conductor pin 14 therein. The outer ends of these contact pins engage the conductor band 10 while the inner ends of these pins terminate at the key slots 12.

The shell 9 is provided with a di-electric plug 10a and a pair of diametrically opposite points thereon intermediate the opposite ends thereof, and each carries a contact 11a which constantly wipes the band 10 on the core 8. Numeral 15 represents a tumbler pin urged downwardly by the spring 16.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having thus described our invention, what we claim as new is:-

In a switch for an alarm circuit, a lock having a pair of contacts in the key slot thereof spaced apart and interposed in the said alarm circuit to maintain said circuit normally open, said contacts being suficiently spaced to permit a metallic key to bridge the same when inserted into the slot, and a key constructed with the outside of its lock inserting portion of di-electric material for normally operating the said lock without electrically bridging the said contacts.

LEOPOLD BLUMEN. JULIUS M. BLUMEN. 

